I believe a working prototype could be made, but it would take a great deal of time and engineering. This isn't fantasy. It's a green vehicle, and all of the numbers are based in the real world.

But who would actually use this? Sure, it looks pretty amazing and you can park it vertically in a garage to save space, but imagine having to unfasten yourself from this every time you get to work. Or the supermarket. Or grandma's house. At least with a Segway you can hop off and do your business. [Popsci via Crunchgear via Boing Boing Gadgets]